At the St. Petersburg, Fla., IndyCar Series race, Holly Wheldon waves the green flag to start the race in honor of her brother Dan Wheldon March 25, 2012.

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Male athletes often talk about their brotherhood, the group with shared experiences that bonds them.

IndyCar has one, too, with a sister who's part of the fraternity. Her name is Holly Wheldon.

Holly wasn't just the youngest sibling of the two-time Indianapolis 500 winner killed a year ago this week at Las Vegas Motor Speedway. She was his most vocal and visible fan, especially in recent years. ...